Bedbugs. I had to cancel my stay and move out to a new location.
Other more minor issues:
Breakfast was listed as available and not mentioned until I'd already arrived it was suspended due to Covid.
Given wrong welcome packet to a different unit than (I thought) I reserved via Airbnb leading to much confusion.
WiFi passport on that second welcome packet was wrong.
Host asked to enter the premises and did so without my permission.